IMPORTANT INFORMATION - Gas · PDF fileIMPORTANT INFORMATION: ... Due to improved intake manifold design, use 100% of ... Impco Carburetor (Mixer) Sizing M od e l # R e l a t e d

293

Carburetors

IMPORTANT INFORMATION: Product must be installed and used in strict conformance with NFPA Pamphlet 58and/or NFPA Pamphlet 54 and all other codes, regulationsand manufacturer recommendations.

Failure to follow these codes, regulations and recommenda-tions could result in hazardous installation, bodily injuryand/or death.

PRODUCT TRAINING SCHOOLS AVAILABLE. Contact a GECcustomer service representative for more information.

WARNING: LP Gas is extremely flammable and explosive.Devices used for handling LP Gas and Anhydrous Ammoniamust be installed and used in strict conformance with NFPAPamphlet 58 and 54 and all other codes, regulations and man-ufacturer recommendations.

294

Carburetor Sizing

Selecting the Correct Carburetor Size

Formulas for Cubic-Feet-Per-Minute (CFM) Air Flow Re-

quirements. Determining specific airflow requirement forany engine requires only the application of the followingformulas:

Naturally Aspirated Engines (Carbureted)CID x RPM /1728/2 x .85 = CFM RequiredThe engine air-flow requirement determined by this formu-la is at 85% of volumetric efficiency for four-cycle engines.For two-cycle engines double the cubic feet/minute valve.

1. Determine the cubic inch displacement of the enginefrom the identification plate or the user’s manual. (If thedisplacement is known in cubic centimeters, convert tocubic inches by multiplying cubic centimeters by .06102.If in liters, convert to cubic inches by multiplying liters by61.02.)

2. Multiply the figure by the RPM figure corresponding tothe maximum engine speed at wide open throttle. (Usethe point at which the tachometer is redlined. If the en-gine is not equipped with a tachometer, refer to the user’smanual supplied with the vehicle or engine.)

3. Divide this CIM (cubic inches per minute) by 1728 toobtain cubic feet per minute.

4. Divide the result by 2 (for 4 stroke engines).5. Multiply the figure you obtain by .85 For 85% volumetric

efficiency).6. This figure is the precise air-flow requirement for the

engine, accurate to one cubic foot/minute.

Example:351 CID x 4000 RPM = 1,404,000 cubic inches per minute1,404,000 /1728 = 812.5 CFM (2 stroke)812.5/2 = 406.25 CFM (4 stroke)406.25 x .85 = 345 CFM (at 85% volumetric efficiency.

Fuel Injected EnginesDue to improved intake manifold design, use 100% of volumetric efficiency for fuel injected engines.CID x RPM /1728 /2 = CFM required.

Example:351 CID x 4000 RPM = 1,404,000 CIM1,404,000 /1728 = 812.5 CFM (2 stroke)812.5 /2 = 406.25 CFM (4 stroke)406.25 X 406.25 CFM (at 100% volumetric efficiency)

Turbocharged Engines

(with mixer upstream of turbocharger)CID x RPM/1728 x 2 x % boost pressure + 1 = CFM Required

Normal air inlet pressure to the engine is 14.7 PSI (one at-mosphere). Adding a turbocharger merely serves toincrease the inlet pressure. For example, 6 PSI boostequates to 14.7 PSI plus 6 PSI, or a combined inlet pressureof 20.7 PSI (or 140% of one atmosphere) at sea level. Hereis how this works starting with the above formula:I. One atmosphere equals 14.7 PSI.II. 6 PSI boost equals 40% of one atmosphere.III. Thus you must multiply the normal CFM by 1.40 to

establish the requirement for six pounds of boost pres-sure.

Example:351 CID x 4000 RPM = 1404,000 CIM1,404,000 /1728 = 812.5 CFM (2 stroke)812.5 / 2 = 406.25 CFM (4 stroke)406.25 x 1.4 = 568.75 CFM (at 6 PSI boost)In selecting the correct carburetor or mixer from the listing,bear in mind whether the conversion is to be straightpropane or dual fuel (propane and gasoline). All models list-ed are available for straight fuel or dual fuel applications.

Impco Carburetor (Mixer) Sizing

#ledoMdetaleR-esroHrewoP

cibuC/teeF.nim

cibuC/teeF

.rh

55+05 HP65 91 604,5

005-05 HP76 081 804,6

001 HP601 701 002,01

521 HP621 022 201,21

571 HP031 102 603,21

002 HP271 762 605,61

522 HP509 293 407,91

,1-A00302-A003

PH712 483 808,02

,05-A00307-A003

PH072 324 209,52

524 HP782 604 006,72

As It Relates to Air FlowVehicle Engine Applications

Wide Open Throttle 1 1⁄2" Manifold Depression

295

Two-Stage Converter

Model J Series -100H.P. LP Gas

NOTES:* Indicates repair kit components.

** Two vapor outlet pressures are available. Orange secondary spring givesnegative 1⁄2" water column. Blue secondary spring gives negative 1 1⁄2"water column. To change any JB converter to JO, change blue secondaryspring to orange.

*** Not shown.

#.feR t #raP onitpircseD

1 -47S y)lnoJledoM(tneverehpsomta,neercS

2 9*5-1S 2 x3-8,wercS 5/8 )6(SMES"

3 34-1CA:yradnoces,.yssarevoC

4-7S,72-1W,12-2S,01-1P,43-1C

4 7*2-1W ermirpdnah,rehsaW

5

*62-1DA:nirdyh,yradnoces,.yssamgarhpaiD

)2(4-2R,72-2P,82-2P,62-1D


)2(4-2R,72-2P,82-2P,72-1D

6 2*4-1S 2 x3-8,wercS 3/8 SMES"

7 37-1L ortalugeryradnoces,reveL

8 8-1P umrclufyradnoces,niP

9 7*2-4S w)en(rotalugeryradnoces,taeS

0153-2S rdadnats,yradnoceseulb,gnirpS

**83-2S alnoitpo,yradnocesegnaro,gnirpS

11 33-1BA 15-1J,41-3P,7-1J,33-1B:,yssaydoB

21 -51S w,ercS 1/4 x02-" 5/8 )2(SMES"

31 6*1-4S ortalugeryramirp,taeS

41 5*8-1G tealpotydob,teksaG

51 26-2P ervocydobrotrevnoc,etalP

61 13-3P g,ulP 1/8 daehxeh,epip"

71 36-2S ortalugeryramirp,gnirpS

81 4*1-1P velavyramirp,niP

91 2*2-1DA:yramirp,.yssamgarhpaiD

63-1L,)3(,3-2R,92-2P,22-1D

02 33-1C ortalugeryramirp,revoC

12 0*1-1S 7)(SMES"1x23-8,wercS

22 ***02-1V velavkcehC

32 ***42-32 ngirreniateR

#traP onitpircseD

J-KR nauB

2-J-KR neociliS

Repair Kits

Impco

296

Two-Stage Converters

Model L Series

325 H.P. - LP Gas

#traP onitpircseD

L-KR nauB

2-L-KR neociliS

NOTES:

In colder climates, the Model L vaporization capacity will be reduced by 20%during WOT operation. Due to lower rate of water flow in industrial appli-cation, Model L is rated at 200 H.P. in these installations.

* Indicates repair kit components.


1 -17S nteverehpsomta,neercS

2 9*5-1S 2 x3-8,wercS 5/8 )8(SMES"

3 63-1CA:yradnoces,.yssarevoC

4-7S,72-1W,12-2S,01-1P,36-1C


5


)2(4-2R,43-2P,61-2P,03-1D

*13-1DA:enocilis,yradnoces,.yssamgarhpaiD

)2(4-2R,43-2P,61-2P,13-1D

6 65-1L ryadnoces,reveL

7 5*2-4S w)en(yradnoces,taeS

8 -71P umrclufrevelyradnoces,niP

9 92-2S e)ulb(rotalugeryradnoces,gnirpS

01 59-1S 2 x3-8,wercS 3/8 )6(SMES"

11 62-1C gmarhpaidyramirp,revoC

212 92-2S 2)(rotalugeryramirp,gnirpS

31 2*3-1DA:yramirp,.yssamgarhpaiD

)2(01-2R,63-2P,53-2P,23-1D

41 57-1BA 18-1J,75-1B:,yssaydoB

51 13-3P g,ulP 1/8 )2(daehxeh,epip"

61 9*5-1S 2 x3-8,wercS 5/8 )5(SMES"

71 61-1C geassapretaw,revoC

81 8*11-1G geassapretaw,teksaG

91 -51S w,ercS 1/4 x02-" 5/8 )2(SMES"

02 34-1P velavyramirp,niP

12 191-1G erbmahcgniziropav,teksaG

22 64-1CA 17-1J,46-1C:rebmahcgniziropav,revoC

32 3*-1S 4 x2-01,wercS 5/8 )9(SMES"

42 18-4S ryamirp,taeS

52 3*2-4S ryamirp,troppustaeS

62 93-2S velavyramirp,gnirpS

72 18-32-HSA 41-1R,52-3B:telnileuf,.yssagnihsuB

82 22-4FA,telnileuF 3/8 xeralf" 3/8 09,TPN" ° ,

)lanoitpo(reniater/w

Impco

Repair Kits

297

Two-Stage Converters

NOTE 1:** Two vapor outlet pressures are available. Orange secondary spring gives

negative 1⁄2" water column. Blue secondary spring gives negative 1 1⁄2" watercolumn. To change any B regulator to O, change blue secondary spring toorange. Due to lower rate of water flow in industrial applications, Model Eis rated at 200 H.P. in these installations.

* Indicates repair kit components.+ For Model E only

NOTE 2: PE Series does not carry UL approval.


1 -17S nteverehpsomta,neercS

2 3*-1S 4 x2-01,wercS 5/8 )8(SMES"

3 -122-1CA:yradnoces,.yssarevoC

4-7S,72-1W,12-2S,01-1P,1-22-1C


5

*1-41-1DA:nirdyh,yradnoces,.yssamgarhpaiD+

)2(3-2R,1-2L,)2(61-2P,1-41-1D

*32-1DA:enocilis,yradnoces,.yssamgarhpaiD+

)2(3-2R,1-2L,)2(61-2P,32-1D

6 86-1LA ryadnoces,reveL

7 5*2-4S w)en(yradnoces,taeS

822-2S rdadnats,)eulb(rotalugeryradnoces,gnirpS

***32-2S alnoitpo,)egnaro(rotalugeryradnoces,gnirpS

9 -71P umrclufrevelyradnoces,niP

01 0*4-1S 4 x2-01,wercS 3/8 )2(SMES"

11 9*3-1S 4 x2-21,wercS 7/8 )7(SMES"

21 20-1C gmarhpaidyramirp,revoC

31 13-2S 2)(rotalugeryramirp,gnirpS

41 15-1DA:yramirp,.yssamgarhpaiD

)3(3-2R,81-2P,41-1L,51-1D

51 11-1P velavyramirp,niP

61 20-1BA 13-1J,02-1B:seiresE,rotaluger,ydoB

71 7*3-1G dyobrotaluger,teksaG

81 1*-3F genopS

91 7*-4S ryamirp,taeS

02 -191-1BA:regnahcxetaeh,.yssaydoB

3-3P,31-3P,7-1J,1-91-1B

12 1*-3P g,ulP 1/8 )2(daehxeh,epip"

22 -33P g,ulP 1/8 niardretaw,ssarb,epip"

32 5*3-1G ervocregnahcxetaeh,teksaG

42 21-1C ergnahcxetaeh,revoC

52 3*-1S 4 x2-01,wercS 5/8 )9(SMES"

#traP onitpircseD

E-KR nauB

2-E-KR neociliS

ImpcoModel E & PE Series

325 H.P. LP Gas - 200 H.P. Ratings

Repair Kits

298

Carburetors

Model CA55

Standard Series Carburetors for Natural & LP GasImpco’s CA55 Series carburetors are offered in four designvariations, providing proven, effective solutions for opti-mum metering and delivery of either alternative fuel or, indualfuel configurations, gasoline in engines up 75 horse-power.The standard model, shown beginning on this page, can bemounted in either an updraft or downdraft orientation, feed-ing either LPG or natural gas to engines from 1.5 to 70horsepower. The maximum flow rate is 115 cfm. VariousSAE flanges and airhorn sizes are available.

Impco

299

Carburetors


1 74-1S ewrcSeldI

2 88-2S ewrcSeldI,gnirpS

3 13-3P g,ulP 1/8 epiP"

4

C1-53-1BA1 1/2 :yssAnroHriA"

8-3P;34-1W;51-1W;41-1W;92-2V;53-1B


8-3P;34-1W;51-1W;41-1W;92-2V;53-1B


8-3P;34-1W;51-1W;41-1W;92-2V;53-1B

C4-53-1BA2 1/ 61 :yssAnroHriA"

8-3P;34-1W;51-1W;41-1W;92-2V;53-1B


8-3P;34-1W;51-1W;41-1W;92-2V;53-1B

5

52941-1VA:).dts(yssAevlaVriA

79641-1W;1-49641-1V;03-2V;21-4S

62941-1VA:)nael(yssAevlaVriA

79641-1W;2-49641-1V;03-2V;21-4S

6 98641-1R velaVriA,gniRgnilaeS

7 45-2S velaVriA,gnirpS

8 00741-2PA 92641-3B;99641-2P:yassAetalPevlaV-kcehC

9 92-1G erxiMotydoBelttorhT,teksaG

01 -14P ffotuCeldI,notsiP

11 44-2S ffotuCeldI,gnirpS

*21 -31S 4 X2-01,wercS 5/8 )4(SMES"

31 69-1S ewrcS 1/4 X82-" 5/ 61 )2("

41

42-2T t,aorhT 1/2 egnalfEAS"


62-2T genalfEAS"1,taorhT

72-2T , 1taorhT 1/4 egnalfEAS"

515 -51P optSelttorhT,niP

61 22-1S 2 X3-6,wercS 1/4 )2(SMES"

71

31-2F y,lF 1/2"

1-2F y,lF 3/4"

2-2F 1",ylF

5-2F , 1ylF 1/4"

81 -65S t,fahSelttorhT 1/4 .aid"

9111-2B e,tiliO,gniraeB 1/4 )2(.d.i"

6-2B e,ldeeN,gniraeB 1/4 )2(.d.i"

02 -83S l,aeS 1/4 )2(tfahs"

12 -91R erniateRlaeS,gniR

22 -18-1LA,yssApotSelttorhT 1/4 :.d.i"

81-1S;12-1S;51-2S,8-1L

32 -81L erveLpotSelttorhT

42 21-1S 2 X3-01,wercSpotS 3/4"

52 15-2S ewrcSpotSeldI,gnirpS

62 18-1S optSelttorhT,niPwercS

72 -17-1LA 17-1S;1-7-1L:wercS/wreveLelttorhT

82 -17-1L erveLelttorhT

92 17-1S 4 X2--01,wercS 5/8"

03

19-1G t,eksaG 1/2 egnalf"


71-1G genalf"1,teksaG

81-1G , 1teksaG 1/4 egnalf"

Model CA55 Standard Series

Impco

1

2

4

5

6

7

8

9

10

1

13

14

3

1516

17

18

30

26

23

27

28

20

19

21

12

22

2425

29

300

Carburetors

Model 100 Series Natural, LP Gas

Standard Carburetors

Impco

301

Carburetors

Model 100 Series

.oN.giF. oNtraP onitpircseD

1 -31S 4 x2-01,wercS 5/8 )4(SMES"

2 17-1C ervoC

3 85-2S velavria,gnirpS

4 22-1S 2 x3-5,wercS 1/4 )4(SMES"

5 22-2P pukcab,etalP

671-1D gmarhpaiD

2-71-1D neocilis,mgarhpaiD

7 19-1R velavria,gniR

8 14-1VB -72V,21-4S,41-1V:.yssaevlavsagriA

9 14-1VAetelpmoc,.yssamgarhpaiddnaevlaV)evlavsagriatcerrocroftrahcotrefer(

01 -5ot1-8-1BA 96-1S,8-3P,21-1R,41-1W,31-1W,21-1W,6-2V,8-1B:.yssaydoB

11 69-1S wercS 1/4 x82-" 5/ 61 )2("

21 74-1S ledi,wercS

31 88-2S ewrcseldi,gnirpS

41 -33P epip"8/1,gulP

51 11-1G erximotydobelttorht,teksaG

61 19-1S 4 x2-21,wercS 5/8 )4(SMES"

71


2-2T gnalfEAS"1,taorhT


1-4-2T , 1taorhT 1/2 egnalfEAS"


61-2T , 1taorhT 1/4 1dna" 1/2 trohs,egnalfEAS"

32-2T , 1taorhT 1/4 trohs,egnalfEAS"

81 -51P )2(potSelttorhT,niP

911-5S tfahselttorhT 1/4 )2-2T,1-2T(.aid"

2-5S )32-2T,61-2T,3-4-2T,1-4-2T,3-2T(.aid"61/5,tfahselttorhT

02

1-2F y,lF 3/4"

2-2F 1",ylF

3-2F , 1ylF 1/4"

4-2F , 1ylF 1/2"

5-2F , 1ylF 3/4"

1222-1S 2 x3-6,wercS 1/4 )2(SMES"

21-1S 2 x3-8,wercS 5/ 61 )2(SMES"

22


21-2B e,tiliO,gniraeB 5/ 61 )2(.d.i"

6-2B e,ldeeN,gniraeB 1/4 )2(lanoitpo.d.i"

7-2B e,ldeeN,gniraeB 5/ 61 )2(lanoitpo.d.i"

32

8-3S l,aeS 1/4 )2(tfahs"

9-3S l,aeS 5/ 61 )2(tfahs"

52-3S l,anretni,laeS 5/ 61 )2(lanoitpo,.D.I"

42 -91R 2)(reniateRlaeS,gniR

521-8-1LA y,ssApotSelttorhT 1/4 81-1S;12-1S;51-2S,1-8-1L:.d.i"

2-8-1LA y,ssApotSelttorhT 5/ 61 81-1S;12-1S;51-2S,2-8-1L:.d.i"

621-8-1L r,eveLpotSelttorhT 1/4 .D.I"

2-8-1L r,eveLpotSelttorhT 5/ 61 .D.I"


82 21-1S 2 x3--01,wercSpotS 3/4"

92 18-1S optselttorht,wercsniP

03 -37-1LA 17-1S;3-7-1L:wercS/w,trohs,reveLelttorhT

1-7-1LA 17-1S;1-7-1L:wercS/w,gnol,reveLelttorhT

13






65-1G , 1teksaG 1/4 1-" 1/2 egnalf"

Impco

302

Carburetors

Model 125 Series

Natural, LP Gas

Impco

303

Carburetors

Model 125 Series


1 66-1G rnohriaotrexim,teksaG

2 47-1S w,ercS 1/4 SMES"1x02-"

3 -31S 4 x2-01,wercS 5/8 )4(SMES"

4 26-1C velavriA,revoC

5 85-2S velavriA,gnirpS

6 22-1S 2 x3-6,wercS 1/4 )4(SMES"

7 22-2P upkcab,etalP

871-1D gmarhpaiD



01 14-1VB -72V,21-4S,41-1V:.yssaevlavsagriA

11 14-1VAetelpmoc,.yssamgarhpaiddnaevlaV

)ylbmessaevlavsagriatcerrocroftrahcotrefer(

21 69-1S w,ercS 1/4 x82-" 5/ 61 )3("

31 25-1BA 14-1W,31-1W,21-1W,6-2V,52-1B:.yssaydoB

41 28-1S ewrcSeldI


61 -33P g,ulP 1/8 ssarb,epip"


81 19-1S 4 x2-21,wercS 5/8 )4(SMES"

91


2-2T gnalfEAS"1,taorhT




61-2T , 1taorhT 1/4 1dna" 1/2 trohs,egnalfEAS"


02 -51P 2)(potSelttorhT,niP

121-5S t,fahselttorhT 1/4 )2-2T,1-2T(.aid"

2-5S 3)2-2T,61-2T,3-4-2T,1-4-2T,3-2T(.aid"61/5,tfahselttorhT

22

1-2F y,lF 3/4"

2-2F 1",ylF

3-2F , 1ylF 1/4"

4-2F , 1ylF 1/2"

5-2F , 1ylF 3/4"

3222-1S 2 x3-6,wercS 1/4 )2(SMES"

21-1S 2 x3-8,wercS 5/ 61 )2(SMES"





62


9-3S l,aeS 5/ 61 )2(tfahs"

52-3S lanretni,laeS 5/ 61 )2(lanoitpo,.D.I"

72 -91R 2)(reniateRlaeS,gniR

821-8-1LA y,ssApotSelttorhT 1/4 81-1S;12-1S;51-2S,1-8-1L:.d.i"


921-8-1L r,eveLpotSelttorhT 1/4 .D.I"



13 21-1S 2 x3--01,wercSpotS 3/4"


333-7-1LA 1-1S;3-7-1L:wercS/w,trohs,reveLelttorhT

1-7-1LA 1-1S;1-7-1L:wercS/w,gnol,reveLelttorhT

43





32-1G1 , 1teksaG 3/4 egnalf"

65-1G1 , 1teksaG 1/4 1-" 1/2 egnalf"

Impco

304

Carburetors

Model 200 Series - Natural & LP Gas


NOTE: (1) DG (digester gas) carburetors reduce air flow 30%

Impco

305

Carburetors

Model 200 Series


1 -31S 4 x2-01,wercS 5/8 )4(SMES"

2 18-1C ervoC


4 12-2S 2 x3-8,wercS 5/ 61 )4(SMES"


61-61-1D gmarhpaiD


7 17-1R velaVriA,gniR

8 12-1VB 16-21V,9-4S,21-1V:.yssaevlavsagriA

9 12-1VAriatcerrocroftrahcotrefer(margaidhtiwetelpmoc,.yssaevlavsagriA

)ylbmessaevlavsag

011-11-1BA , 2.yssaydoB 5/8 31-1R,02-1W,91-1W,81-1W,01-2V,1-11-1B:nrohria"

2-11-1BA , 3.yssaydoB 1/ 61 31-1R,91-1W,81-1W,02-1W,01-2V,2-11-1B:nrohria"


21 28-1S ledI,wercS


41 19-1S 4 x2-21,wercS 5/8 )4(SMES"

51 -33P gulP 1/8 epiP"

61

2-4-2T , 1taorhT 1/2 egnalFEAS"

5-2T , 1taorhT 3/4 egnalFEAS"

6-2T genalFEAS"2,taorhT


812-5S t,fahSelttorhT 5/ 61 )2-4-2T(.aid"

3-5S t,fahSelttorhT 3/8 )6-2T,5-2T(.aid"

91

4-2F , 1ylF 1/2"

5-2F , 1ylF 3/4"

6-2F 2",ylF

61-2T , 1taorhT 1/4 1&" 1/2 trohS,egnalFEAS"


02 12-1S 2 x3-8,wercS 5/ 61 )4(SMES"




8-2B eldeeN,gniraeB 3/8 )2(lanoitpo.d.i"

329-3S l,aeS 5/ 61 )2(tfahs"


42 20-3S l,anretni,laeS 3/8 lanoitpo,.D.I"

529-1R r,eniateRlaeS,gniR 5/ 61 )2(tfahs"

8-1R r,eniateRlaeS,gniR 3/8 )2(tfahs"


01-1LA y,ssApotSelttorhT 3/8 81-1S;12-1S;51-2S,01-1L:.d.i"

722-8-1L re,veLpotSelttorhT 5/ 61 .D.I"

01-1L r,eveLpotSelttorhT 3/8 .D.I"

82 15-2S ewrcSpotS,gnirpS

92 21-1S 2 x3--01,wercSpotS 3/4"


131-7-1LA -17-1L,71-1S:htiw,reveLelttorhT


231-7-1L erveLelttorhT

1-9-1L erveLelttorhT

3371-1S 4 x2-01,wercS 5/8"

62-1S 4 x2-21,wercS 5/8"

43




Impco

306

Carburetors

Model 225 Series - 2V- Natural & LP Gas


NOTES:

(1) Order air filter separately.(2) Refer to optional equipment for dimension information.

Model 225 Series -1V - Natural & LP Gas


NOTES:

(1) Order air cleaner assembly separately.(2) Order air horn separately, refer to optional equipmentfor specific air horn.

Impco

307

Carburetors

Model 225


1 73-1G rnohriaotrexim,teksaG

2 47-1S w,ercS 1/4 SMES"1x02-"

3 -31S 4 x2-01,wercS 5/8 )5(SMES"

4 25-1C velavriA,revoC


6 12-1S 2 x3-8,wercS 5/ 61 )4(SMES"


81-61-1D gmarhpaiD



0121-1VB 16-2V,9-4S,21-1V:enaporp,.yssaevlavsagriA

21-1VD 17-2V,9-4S,21-1V:saglarutan,.yssaevlavsagriA

1121-1VA neaporp,margaidhtiwetelpmoc,.yssaevlavsagriA

21-1VC asglarutan,margaidhtiwetelpmoc,.yssaevlavsagriA

21 23-1BA 20-1W,91-1W,81-1W,01-2V,32-1B,.yssaydoB

31 16-2S ewrcseldi,gnirpS

41 28-1S ewrcseldi

51 69-1S w,ercS 1/4 x82-" 5/ 61 )3("

61 -33P g,ulP 1/8 ssarb,epip"


81 19-1S 4 x2-21,wercS 5/8 )4(SMES"

91

2-4-2T ,t 1aorhT 1/2 egnalfEAS"


6-2T genalfEAS"2,taorhT


122-5S t,fahselttorhT 5/ 61 )2-4-2T(.aid"

3-5S t,fahselttorhT 3/8 )6-2T,5-2T(.aid"

22

4-2F , 1ylF 1/2"

5-2F , 1ylF 3/4"

6-2F 2",ylF

32 12-1S 2 x3-8,wercS 5/ 61 )4(SMES"





629-3S l,aeS 5/ 61 )2(tfahs"


72 20-3S l,anretni,laeS 3/8 lanoitpo,.D.I"

829-1R r,eniateRlaeS,gniR 5/ 61 )2(tfahs"

8-1R r,eniateRlaeS,gniR 3/8 )2(tfahs"


01-1LA y,ssApotSelttorhT 3/8 81-1S;12-1S;51-2S,01-1L:.d.i"


01-1L r,eveLpotSelttorhT 3/8 .D.I"

13 1-2S ewrcSpotS,gnirpS

23 2-1S 2 x3--01,wercSpotS 3/4"




5362-1S 4 x2-21,wercS 5/8"

71-1S 4 x2-01,wercS 5/6"

631-7-1L

reveLelttorhT1-9-1L

73


32-1G ,t 1eksaG 3/4 egnalf"


Impco

308

Carburetors

Model 300A Series

Natural & LP Gas for Dual

Fuel Standard Mixers

Complete mixer with 14" air filter

Complete mixer with-out air filter

Complete mixer with 10" air filter

Impco

309

Carburetors

Model 300A Series 1 & 50

* Indicates components of minor repair kit.+ Indicates components of major repair kit.


1 -31S 4 x2-01,wercS+ 5/8 )3(SMES"

2 -23P ntemtsujdaeldi,gulP

3 -41EA 51-1W,41-1W,21-1W,9-2V,4-1E:tnemtsujdarewophtiwwoblE

4 * **2-1G owblesag,teksaG+*

5 -931R erniaterlaes,gniR+*

6 -3S ewrcseldi,laeS+*

7 -41-1EB -33S,9-1R,4-1EA,2-3P:etelpmoc,.yssawoblE

8 15-1S ntemtsujdaeldi,wercS

92-4S y)lnoA003AC(evlavsag,taeS*

02-4S y)lno05-A003AC(evlavsag,taeS+

01

11-2V.)ylnoA003AC(gniretemsag,evlaV

evlavsagtcerrocroftrahcotrefeR

93-2V.)ylno05-A003AC(gniretemsag,evlaV

evlavsagtcerrocroftrahcotrefeR

11 -32S velavsag,gnirpS

2111-2VA )ylnoA003AC(3-2S,11-2V,2-4S,51-1S:etelpmoc,.yssaevlavsaG+

93-2VA )ylno05-A003AC(3-2S,93-2V,02-4S,51-1S:etelpmoc,.yssaevlavsaG+

31 -61S 3)("1x42-01,wercS+

41 -31N 3)(42-01emod,tuN+*

51 -21W 6)(talfthgil01.oN,rehsaW+

61 -1G ervocretlif,teksaG+*

71 -2R velavtnev,teviR+

81 1-1V ntevrevoc,evlaV+

912-1C y)lnoA003AC(mgarhpaid,revoC

3-2-1C y)lno05-A003AC(mgarhpaid,revoC

022-1CA )ylnoA003AC(2-1C,31-1V,2-2R:evlavtnevhtiwmgarhpaid,.yssarevoC

3-2-1CA )ylno05-A003AC(3-2-1C,31-1V,2-2R:evlavtnevhtiwmgarhpaid,.yssarevoC

12 -2S velavria,gnirpS+

22 1-1S 2 x3-8,wercS 5/ 61 )4(SMES"

32 -2P upkcabmgarhpaid,etalP

421-1-1D velavria,mgarhpaiD*

2-1-1D neocilis,evlavria,mgarhpaiD*

52 1-1G velavria,teksaG*

62 -1R velavria,gniR

72 1-1VB 24-3B,3-1L,01-1V:gniretemria,evlaV

82 -1L ntemtsujdaeldinolyn,kcoL*

92

1-01-1VA,51-1G,1-1-1D,1-2P,)6(21-1S:mgarhpaidhtiwetelpmoc,.yssaevlavriA+

)ylnoA003AC(42-3B,3-1L,01-1V,2-1R

2-01-1VA,2-1-1D,1-2P,)6(21-1S:mgarhpaidenocilishtiwetelpmoc,.yssaevlavriA+

)05-A003AC&A003AC(42-3B,3-1L,01-1V,2-1R,51-1G

033-1R y)lnoA003AC(troppusmgarhpaid,gniR

04-1R y)lno05-A003AC(troppusmgarhpaid,gniR

13 -51S w,ercS 1/4 x02-" 5/8 )3(SMESdaehxeh"

23 -41S x42-01,wercS+ 1/2 )3(SMES"

33 -12C reiwnedoB,pmalC

43 -81S 2 x3-01,wercS 5/8 )3(SMES"

532-1BA )ylnoA003AC()3(1-1P,)3(1-2S,2-1B,2-1L:etelpmoc,.yssaesaB

2-1BB )ylnoA003AC()3(1-1P,)3(1-2S,2-1B,2-1L:etelpmoc,.yssaesaB

63 -51N 20-"4/1,erauqs,tuN

73 69-1S g)ulp("61/5x"4/1,wercS

83 -22C7 -71S,2-1W,2-2C:.yssamaC

#traP onitpircseD

2-02/1-IM003KRtikriaperroniM

2-07/05-IM003KR

2-02/1-AM003KRtikriaperrojaM

2-07/05-AM003KR

Repair Kits

Impco

310

Carburetors

Model 425 Series

(1) Reference diagram pg.3(2) Indicates silicon diaphragm

(425-1V Illustrated)

Impco

Standard Carburetors for Natural & LP Gas

311

Carburetors

Model 425 Series - 2V


1 66-1G rnohria,teksaG

2 -31S 4 x2-01,wercS 5/8 )5(SMES"

3 30-1C mgarhpaidevlavriA,revoC


5 22-1S 2 x3-6,wercS 1/4 )4(SMES"


781-1D velavria,mgarhpaiD

52-1D neocilis,evlavria,mgarhpaiD

8 021-1G velavria,teksaG

9 16-1VB 14-4S,91-2V,61-1V:evlavsagriA

01 16-1VAmgarhpaidhtiw,.yssaevlavsagriA

y)lbmessaevlavsag-riatcerrocroftrahcotrefer(

11 27-1BA,61-2S,05-1S,9-1J,92-1C,2-72-1B:.yssaydoB

5-1J,)3(96-1S,)3(3-3P,81-2V,72-3S,33-1W

21 69-1S w,ercS 1/4 x82-" 5/ 61 )4("

31 -33P g,ulP 1/8 )3(epip"

41 13-4S ewrcseldi,taeS

51--82-1DA

1:.yssamgarhpaideldI

31-4S,)2(4-2R,32-2P,03-1L,611-1G,82-1D

61 161-1G gmarhpaideldi,teksaG

71 24-2S velaveldi,gnirpS

81 31-1C evlaveldi,revoC

91 40-1S 4 x2-01,wercS 3/8 )4(SMES"

02 89-2S ntemtsujdaeldi,gnirpS

12 51-1S x 123-01,wercS 1/4 tsujdaeldi,"

22 74-1G ertpadaotrexim,teksaG

32 47-3A dyobelttorhtotrexim,retpadA

42 19-1S 4 x2-21,wercS 5/8 )4(SMES"

52 21-1G dyobelttorhtotretpada,teksaG

62 24-1B ltetorhtB2,ydoB

72 -61P 2)(potselttorhT,niP

82 -33P g,ulP 1/8 epip"

92 -53P g,ulP 1/4 epip"

03 19-1S 4 x2-21,wercS 5/8 )4(SMES"

13 31-1S 2 x3-01,wercS 5/ 61 )2(SMES"

23 10-2F 2B,ylF

33 -45S t,fahselttorhT 7/ 61 .aid"


9-2B ),lanoitpo(eldeen,gniraeB 7/ 61 )2(.d.i"

5321-3S l,aeS 7/ 61 )2(tfahs"

91-3S )lanoitpo(lanretni,laeS 7/ 61 )2(.d.i"

631 1-1R 2(reniateRlaeS,gniR

73 -111-1LA,.yssApotSelttorhT 7/ 61 :.d.i"

81-1S;12-1S;51-2S,1-11-1L

83 -111-1L r,evelpotSelttorhT 7/ 61 .d.i"

93 15-2S ewrcspots,gnirpS

04 21-1S 2 x3-01,wercspotS 3/4"

14 -81S optselttorht,wercsniP

24 -321-1LA 32-1S,3-21-1L:wercshtiw,gnol,reveLelttorhT

34 -321-1L ngol,reveLelttorhT

44 32-1S w,ercS 1/4 x02-" 7/8 daehxeh"

54 44-1G genalfotydobelttorht,teksaG

64

11-2TB , 1egnalF 1/4 teksaghtiw,B2"

21-2TB ,1egnalF 1/2 teksaghtiw,B2"

31-2TB etksaghtiw,B2yelloH,egnalF

51-2TB , 1egnalF 1/2 teksaghtiw,B2CMG"

74 19-1S 4 x2-21,wercS 5/8 )4(SMES"

84

54-1G , 1teksaG 1/4 egnalFB2"

64-1G , 1teksaG 1/2 egnalFB2"

74-1G genalFB2yelloH,teksaG

94-1G ,t 1eksaG 1/2 egnalFB2CMG"

Impco

312

Carburetion - Vacuum Fuelock Filter

Model VFF30 Series

325 H.P. - LP Gas

NOTE:

O-ring must be secured with washer when service is required. Washer isinstalled through LP-gas outlet and locked in slot by pin. Silicone grease willlet pin slide easily. Be sure to properly lubricate "O" ring. Refer to ServiceManual for further information.


1 59-1S 2 x3-8,wercS 5/8 )6(SMES"

2 37-1C y)lno03FFV(mgarhpaid,revoC

3 27-1DB:enocilis,.yssamgarhpaiD)2(4-2R,)2(82-2P,72-1D

4 -71S 32-8,wercS 1/4 )2("

5 -23F umrcluF

6 39-1L ngitarepoevlav,reveL

7 42-1W nginiaterlaes,rehsaW

8 34-1BA -81J,43-1B:.yssaydoB

9 -51S w,ercS 1/4 x02-" 5/8 )2(SMES"

01 18-4S velav,taeS

11 15-1P ngitarepoevlav,niP

21 42-3S ngir-O,laeS

31 40-2S velav,gnirpS

41 12-1S 2 x3-8,wercS 5/ 61 SMES"

51 -37S upkcabretlif,neercS

61 10-1F ertliF

71 10-1FA -37S,01-1F,.yssagniretliF

81 89-1G ervocretlif,teksaG

91 38-1C ertlif,revoC

02 001-1S 4 x2-21,wercS 3/4 )01(SMES"

Part # Description

RK - VFF30-2 Vacuum Fuelock-Filter Repair Kit

Impco

Repair Kit

313

Carburetion - Adapter System

Unidapt™

Impco’s modular carburetor adaptor system, Light-weightdie-cast components for custom-fit installation of Impco CA125 and CA 300A series mixers.

#traP onitpircseD

003AC&571AC erximtpadinU,retpadA

#traP onitpircseD

35-1A rseximseires521ACot,retpadA

#traP onitpircseD

75-1AA 4)(swercs5-1S,teksag531-1G,dooh75-1A,yssaretpadA

#traP onitpircseD

95-1AA 4)(swercs5-1S,teksag531-1G,egdew95-1A,yssaretpadA

#traP onitpircseD

06-1AA 4)(swercs5-1S,teksag531-1G,noisnetxe06-1A,yssaretpadA

#traP onitpircseD

26-1A o 3t,retpadA 1/8 nrohria"

#traP onitpircseD

16-1A o 5t,retpadA 1/8 nrohria

#traP onitpircseD

85-1A rnohriaatoyoTot,retpadA

#traP onitpircseD

45-1A o 3t,retpadA 1/8 nrohria"

#traP onitpircseD

55-1A , 2retpadA 5/8 nrohria"

#traP onitpircseD

65-1A o 2t,retpadA 5/ 61 nrohria"

#traP onitpircseD

36-1A rseximseiresA003-ACot,retpadA

The modular system offers selection and combination ofinterchangeable components to satisfy most space require-ments and gasoline carburetor air horn size.

314

Carburetion - Adapters

#retpadA . AaiD . BtH onitpircseD

1-3-1A 3/ 61 "1 1/4"

4otA571&A003 3/ 61 nrohria"

4-1A 5/8" 8 1VtelorvehCotA571&A003 1/4 nrohriaxelpud"

6-1A 1/ 61 " 7/ 61 " o 1tA571&A003 1/4 nrohriaxelpud"

1-61-1A 1/8" 3/8" o 5tA571&A003 1/8 )02-9AnnaG(nrohria"

2-61-1A 1/8" 7/8" o 5tA571&A003 1/8 )12-9AnnaG(nrohria"

93-1A

2 5/8" 1/2"

2otA571&A003 5/8 eliforphgih,nrohria"

04-1AA2otA571&A003 5/8 .stunpmalc/w,nrohria"

)3(32-1S,)3(21-1N,83-1A

14-1A 5/ 61 " 1/4" o 2tA571&A003 5/ 61 nrohria"

2-05-1A5 1/8"

1 1/2"5otA571&A003 1/8 ;tesffonrohria"

37-2ArecapsseriuqerrelsyrhC&MGroF

22-9A 3/8" h 5tiwroterubracenilosagotA003 1/8 nrohria"

4

2

3

5

5

2

1

1

3

2

1

2

A1 Series Adapters

300A and 175A mixers to gasoline carburetor air horn.

Center Stud Air Horn

B

A

#traP onitpircseD

3-46-1AAelttorhtL0.5droFretal&2891otA571&A003

)62-9AnnaG(IFEydob

#traP onitpircseD

64-2AA e)liforpwol(M524ACot"5,seerged09.yssaretpadA

#traP onitpircseD

2-04-2AA 5M24ACotSC"5,seerged09,ylbmessaretpadA

315

Carburetion - Air Filter Assemblies

Impco

Add approximately 5⁄8" to height for stud and nut.

AF1 Series

*Filter assembly fits on mixer.

Impco Accessories

Electric Primer

Electric solenoid for remote priming of Impco models E, J, or L and OHG X-1 or X-2 converters.

Vacuum Control Solenoid

Start Assist Valve

Vacuum Power Valve

#traP onitpircseD

SCV idoneloslortnocmuucaV

#traP onitpircseD

4012-9901-64 ermirpcirtcelE

#traP onitpircseD

VPV r valveewopmuucaV

#traP onitpircseD

VS velaVtsissAtratS

316

Carburetion - Accessories

Beam Converter

#trPa onitpircseD

B-0T5yradnocesdnayramirpgninibmocPH04otpurofrotalugersaGPLllamsAllams-skcurtlairtsudnillams-senignedelooc-riaroftinuelgnisaninoitces

senarc-srexim-spmup-srotareneg-senigneyranoitats

B-0T6;senignedeloocretawrofrewopesroh06otpurofrotaluger/reziropaV

senignelairtsudnillamsdnasrotcartmraf,stfilkrofroF

Repair Parts

#traP onitpircseD

KR-06 ortrevnoc06ledoMdna05ledoMroftikriapeR

Beam Lockoffs

#traP onitpircseD

614-L C,DV21-V6yficepsffokcolGPL 1/4 xtelnielamef" 1/4 .teltuoelam"

602-LFCDV21-V6yficepsffokcolenilosaG 1/8 x" 1/8 .daerhtepipelamef"

)226-TGsecalper(

Repair Parts

#traP onitpircseD

721-B 164-LrofliocV21

2114-L 164-LrofylbmessaregnulP

Repair Kits for Obsolete Beam Converters

t #raP onitpircseD

K-R-004 -B004ledomroftikriapeRroniM

KCR-B004 -B004ledomroftikriapeRrojaM

KR-A021 ortrevnoc021ledomroftikriapeR

L-416

#traP onitpircseD

102-F PGLrofylnoretliF 1/4 xtelnielamef" 1/4 .teltuoelam"

812-LF esnigne.D.I.C002rednurofevlavdionelos&retliF

814-LF esnigne.D.I.C002revorofevlavdionelos&retliF

FL-418FL-218F-201

Filters & Solenoid Valves

317

Carburetion - Century Fuelocks

Century

Universal Bulkhead

#traP onitpircseD

5562otedistelnirofsgninepoowT.GPLrofretliF-daehklublasrevinU

.retlifkcapsiomahC.V21.evlavfeilertatsordyhetadomocca

4971-682 itkretliftnemecalpeR

#traP onitpircseD

B4832 PGLrofkcoleufretliF 1/4 .retlifkcapsiomahC.V21,tuo/niTPNF"

4971-682 t #raproftikretliftnemecplaeR 4B832

A3452 e.nilosagrofkcoleuF 1/8 .tuo/niTPNF"

265-323 iloctnemecalpeR t #raprof ltov21,A3452

1432 n.oitacilppatfilkrofGPLrofkcoleuF 1/4 xTPNM" 1/4 .V21,TPNF"

025-323 ilocmentecalpeR t #raprof ltov21,1432

Repair Kits For Century Fuelocks

#traProF

kcoleuF#traP

noitpircseD

6-013

B4832

regnulphtiwtikriapeR

625-323 2V1,ylnolioC

925-323 2V1,ylbmessarevoc&lioC

025-323 4132 2V1,revoc&lioctnemecalpeR

265-323 3A452 2V1,revoc&lioctnemecalpeR

Approved Vacuum Switch

#traP onitpircseD

01-041sienignelitnunepootffo-kcolGPLwollatonlliwhctiwsmuucaV

.gniknarcrogninnur

2384B2543A

2341

Fuelocks

318

Carburetion - Century Converters

Century Converters

Century offers a complete line of straight fuel carburetorsfor highway and industrial use. Call for additional informa-tion on your particular application. Additional literature isavailable.

Can be used for any application where a consistent fast idlespeed is repeatedly required. It is designed especially tocontrol engine speed while pumping from a bulk truck.

#traP onitpircseD

B9222. lortnoCdeepSyrutneC

Model G-85

#traP onitpircseDriapeR

#tiK

B5332 HP58otpusnoitacilppA 5451-682

Model G-85A

Century offers a full range of converters to cover every ap-plication need. These converters can be used for eitherstraight fuel or dual fuel installations. All units are availablewith solenoid primer.

Model M-6

Model H

Century Converter Repair Kits

#traP l #edoMrotrevnoCroF

1031-682

2331-682 M5

4551-682 85-G

8861-682 M6

H

Century Speed Control

319

Carburetion - Gann Adapter Systems

GannAdapter Systems

#traP tselnI onitpircseD

04-9A2owtsaH 1/4 stelniretemaid"

.xobriaMEOotnoitcennocrof.lairetametisopmoc/nolyN.hgih"3

A9-1

A9-36

CA-425

X-450

A9-40

How Gann Adapter Systems Work ...

320

Carburetion - Gann Adapters

Gann Adapters

#traP onitpircseD

21-9A

.ydobelttorht1-9BTot522-ACocpmIehtstnuoMsnoitallatsnietatilicafottesffonoN

.melborpasirenaelcriaerehw1/8 hgih"

#traP onitpircseD

31-9A

524-ACocpmIrofydobelttorht3-9BTotstnuoMenilosaglanigironodesuebtonnaC.noitacilppa

.tropmuucavyramirpsaH.seidobelttorht.dedivorpswercsdnateksaG 7/8 hgih"

#traP onitpircseD

51-9A

reximleuflaudA003-ACehtstnuoM.gnicapstlob524-ACocpmIehtot

.dedivorpswercsdnateksaG1 3/4 hgih"

#traP onitpircseD

12-9AotA003-ACehtstnuoM

.roterubracenilosaggnitsixe2 3/4 hgih"

#traP onitpircseD

71-9A

tfarcrotoMdroFotA003-ACstnuoMnrohrialanigiroehtgnivomerybroterubrac

.retpadasihthtiwgnicalperdna1.dedivorpswercsdnateksaG 1/4 hgih"

#traP onitpircseD

02-9AenilosaggnitsixeotA003-ACocpmIstnuoM

5ahtiwroterubrac 1/8 .nrohria"3 1/2 hgih"

#traP onitpircseD

91-9A.nrettaptlob522-ACot521-AC

3/4 hgih"

#traP onitpircseD

61-9A

reximleuflaudA003-ACehtstnuoM.gnicapstlob522-ACocpmIehtot

.dedivorpswercsdnateksaG2 3/4 hgih"

#traP onitpircseD

81-9A

rofsedivorpdnaroterubrac521-ACnostnuoMrenaelcrialanigiroehtfognitnuomeht

.senigne6-VMGno2 1/4 hgih"

321


Gann Adapters

#traP onitpircseD

22-9AenilosaggnitsixeotA003-ACocpmIehtstnuoM

.nrohria"8/15ahtiwroterubrac2 3/8 hgih"

#traP onitpircseD

3-82-9A

sroterubracdetcejni-leuf022-MGstiF.L4.7dnaL7.5,L0.5gnidulcni

.ydobelttorhtenilosagno524-ACocpmIstnuoM.renaelcrialanigirofoesuswollA

#traP onitpircseD

2-13-9A

noA003-ACocpmIfonoitallatsniswollA.ydobelttorhtnoitcejnileufMG.snoitacilppaGN/GPLthgiartsroF

.teksaghtiwsemoC

#traP onitpircseD

62-9AA003-ACdna571-ACocpmIstpadA

.senignedetcejni-tropdroFot

#traP onitpircseD

92-9A

enilosagynano054-XGHOehtfoesuehtswollAdenibmocnehwnrohria"8/15ahtiwroterubrac

.22-9Aro12-9A,02-9AsretpadannaGhtiw.leetS

#traP onitpircseD

23-9Aydobelttorhtenilosagno524-ACocpmIstnuoMdna663,CMG0991stiF.renaelcrialanigirohtiw

.noitcejnileuf.d.i.c724

#traP onitpircseD

72-9AmetsysnoitcudniriaotA003-ACocpmIstcennoCllamsdnaegralsmetsysdetcejni-tropdroFno

.noitisopmocnolyn/citsalPdesoh

#traP onitpircseD

03-9A.1-9BTno524ACocpmIstnuoM

.dedulcniteksagdnaswercS

#traP onitpircseD

43-9Astcennocduorhsriacitsalp/nolyN

metsysnoitcudniriaMEOesoh-laudeht.rexim524-ACro054-Xnaot

322


Gann Adapters

#traP onitpircseD

53-9A

.senigneIFEL0.3droFno522-ACocpmIstnuoMwolfriassamnoreximstnuomretpadaeerged54

swercsgnitnuoM.noitisoplatnozirohnirosnes4-9F:retlifriadednemmoceR.dedulcni

#traP onitpircseD

,83-9A83-9AA

,senignenoitcejnitropdroFegralofretpadA2(eloh-owtgnidivorp 1/4 otstelni)retemaid"

owtsaH.524AC 1/2 .eniltnevrofsessobTPN".swercs&retpada/w83-9AA,ylnoretpada83-9A

#traP onitpircseD

24-9A

IFEL6.4noreximBFI002ocpmIfoesuswollAotdedulcnignittifssarB.stcudorpyrucreM/nlocniL/droFebtsumrexiM.lortnocdeepseldirofeethcnarbetaerc

deppatdnadellird 1/4 .hgih"2.tropmuucav2-FVrof02-"

#traP onitpircseD

34-9ArofseidobelttorhtMGotrexim054-XGHOstpadA

1.snoisrevnocGN/GUdetacided 3/8 .hgih"

#traP onitpircseD

73-9A

.senigneIFEL0.4droFno522-ACocpmIstnuoMwolfriassamnoreximstnuomretpadaeerged54

swercsgnitnuoM.noitisoplatnozirohnirosnes.4-9F:retlifriadednemmoceR.dedulcni

#traP onitpircseD

44-9A5noretnec-ffoA-003stnuoM 1/8 nrohria"

.snoitacilppaydobelttorhtMGni3 3/4 .hgih"

#traP onitpircseD

,63-9A63-9AA

norexim524ACfognitnuomenil-niswollA2owT.senigneIFE8-VdroF 1/4 retemaid"

,ylnoretpada63-9A.stelniesohswercsdnateksag/wretpada63-9AA

323


Gann Adapters

#traP onitpircseD

54-9A.tceridotekatnidroFesoh-laudstcennoC

.citsalP.A003-AC

#traP onitpircseD

64-9AotekatnidroFesoh-laudstcennoC

.citsalpdedloM.522

#traP onitpircseD

84-9A.senignedroFretil-9.4no522ACstnuoM

.munimulatsaC

#traP onitpircseD

94-9Aretil-8.5/0.5droFno522ACfoesuswollA

.munimulatsaC.senigne

#traP onitpircseD

05-9A

htiwselcihevMGnorexim054-XGHOstnuoM5 1/8 retil-7.5dna,0.5,-3.4sahcussnrohria"

rodutselgnisrehtienostnuoM.snavdnaskcurt2.seidobelttorhtdutslaud 3/4 hgih"

#traP onitpircseD

2-05-9A5htiwselcihevMGno054-XstnuoM 1/8 ria"

emaS.snoisrevnocdetacidednisnroh.eliforpwoltub,05-9Asasnoitacilppa 7/8 .hgih"

#traP onitpircseD

45-9AA5no524-ACfognitnuomelgna-thgiR 1/8 nrohria"

4 1/4 hgih"

#traP onitpircseD

55-9AA5no524-ACocpmIfognitnuomeerged09 1/8"

.nrohria 1/2 .45-9Anahtrellat"4 3/4 hgih"

#traP onitpircseD

25-9AAtcennocotretpadaeerged09

5otesoh"4 1/8 .nrohria".munimulatsaC

324


Gann Adapters

#traP onitpircseD

65-9AA5no524-ACocpmIfognitnuomeerged09 1/8"

.eliforpwol,tesffO.nrohria

#traP onitpircseD

85-9A3ot054-XGHOstpadA 1/4 3ro" 1/2 .esohelgnis"

hgih"1.leetS

#traP onitpircseD

054X-06-9A

.senigne01-VegdoDno054-XGHOfoesuswollAtnuomylpmis;retpadamunimulatsactrap-owTflahmottobehttnuom,flahpotehtno054-Xeht

owtehtelbmessaneht,ydobelttorhtehtnohgih"1.dedulcnierawdrahdnasteksaG.sevlah

#traP onitpircseD

75-9A.esoh-elgnisdroFstcennoctennobmunimulA

.524-ACro054-Xrehtieotekatni"3

#traP onitpircseD

95-9A3ot524-ACstpadA 1/4 3ro" 1/2 .esohelgnis"

.hgih"1.leetS

#traP onitpircseD

524-06-9A01-VegdoDno524-ACocpmIfoesuswollA.evoba054X-06-9AsaelytsemaS.senigne

hgih"1.dedulcnierawdrahdnasteksaG

#traP onitpircseD

31-9TA

ehtstnuoM.524-ACocpmIottejardauQMGynadnaydobelttorht8-9BTot054-XGHO

524-ACocpmIehtgnizilituydobelttorhtgnitsixe.rotubirtsidroftropmuucavsaH.gnicapstlob

1.dedivorpswercsdnateksaG 3/8 hgih"

325

Carburetion Fittings

Nylon Elbows Nylon Straight

Nylon Crankcase Vent Fitting Assembly Nylon Fuel Pump PlateGasket is included.

#traP PTN-esoH

NE35 5/8 x" 3/8"

NE45 5/8 x" 1/2"

NE48 1" x 1/2"

NE68 " x1 3/4"

NE88 1"x"1

NE801 1/4 "1x"1

#traP PTN-esoH

3SN5 5/8 x" 3/8"

86SN " x1 3/4"

88SN 1"x"1

#traP PTN-esoH

21-NE45 5/8 x" 1/2"

#traP PTN-esoH

N2261 3/4"

retnectlob

326

Carburetion - Gann Hose Fittings

Zinc

Brass Hose Elbows

All brass fittings produced from extruded bar stock.

Brass

Crankcase Vent Fitting Assemblies

Illustrated is the Impco 300 Mixer with Gann 54EN-12 fittingto adapt crankcase ventilator hose. Includes 2 jam nuts andgasket. Zinc material unless otherwise noted.

Zinc Hose Elbows

Die-cast, machined zinc material unless otherwise noted.

Zinc Straight Hose Nipples

Zinc material, die-cast and machined.

Part # PTN-esoH

*ZS68 x"1 3/4"

*ZS68 "1x"1

Brass Straight Hose Nipples

All brass fittings produced from extruded bar stock.

•AIso available in nylon

Part # PTN-esoH

*BS35 5/8 x" 3/8"

*BS45 5/8 x" 1/2"

Zinc & Nylon

Brass

327

Carburetion - Miscellaneous Fittings

Water Hose Connections

Part # onitpircseD

NY5566 r YetawlasrevinU 3/4 x" 5/8 )nolyn("

6655YN

Compression Connector

Part No. 68A - Tubing to male pipe.

Plastic Tie Straps

Plastic tie strap - positive lock. 7 inches long.

Part # onitpircseD

2TSS ngolsehcni7,kcolevitisoP

Part # genaR

6075 3/8 -" 5/8"

8075 7/ 61 "1-"

0175 1/2 1-" 1/ 61 "

2175 1/2 1-" 1/4"

6175 3/4 1-" 1/2"

4275 1/ 61 "2-"1 GC-6 Strap Clamp9⁄32" mounting hole for 3⁄8" hose

Hose ClampsWorm gear clamps

Clamps

622 622-N 613-A

Fuel Pump Block Off Plates

Part # onitpircseD

226 3/4 (sretnectlob" 7/ 61 teksagsedulcni,)kciht"

N-2262 5/8 teksagsedulcnisretnectlob"

A-316 7/8 (sretnectlob" 7/ 61 teksagsedulcni,)kciht"

1

2

2

328


NOTE:

CVH-100 available in 25ft. or 50 ft. coils

Part # D..I

850-HVC 5/8"

001-HVC 1"

411-HVC 1/4"1

Bulkhead Fittings

Part # onitpircseD

344T 1/4 xsyaw2TPN" 3/8 eralf"

444T T"" 1/4 syaw3TPN"

33-FTS ngittifdaehklubthgiartS 3/8 xeralf" 3/8 eralf"

6683-VP acplesfeiler/weetdaehkluB

T443 T444

STF-33

Vacuum Hose

Part # D..I

564-06 3/ 61 "

Vapor Hose

Neoprene lined, oil and heat resistant, coil wire support per-mits free flow regardless of degree of bend. This is a non-porous vapor hose for LP gas and natural gas.

Water Heater Hose

Single braid of nylon reinforcement, oil and grease resistant.

Vacuum Y

PV-3866

Developed for applications wherever a strong, corrosion resistant LPGas hose is desired. The special low extracttube handles propane or butane in liquid and gas form.

WARNING!!: For LP and Natural Gas use only! Do not use in anhydrous ammonia or refrigeration applications!

Do NOT use male swivel couplings or any type of couplings that use O-Ring sealing surfaces!

Size I.D. Part Number

1/4" SS25UL-4

5/16" SS6-UL

13/32" SS25UL-8

1/2" SS25UL-10

U.L. 21 Dayco. Series 7243 w/cloth cover

Hose I.D. Flare Size Description Coupling P/N Use with Hose

1/4" 1/4" Straight 6FS-4 SS25UL-4

5/16" 3/8’ Straight 6FS SS6-UL

5/16” 3/8’ 90 degree 6FS-90 SS6-UL

5/16” 3/8’ 45 degree 6FS-45 SS6-UL

5/16“ 1/4” MNPT Straight 6-4MP SS6-UL


1/2" 1/2" Straight 6FS-8-10 SS25UL-10


Hose Ends for Parker/Dayco (Series 7243) wire braid hose.

Use only with Parker/Dayco series BN hose end fittings.

Stainless Steel Wire Braid Hose and Fittings

329


344

Boden Wire Control Cable

42-200344-5210 44-3200 44-9200 44-6210

Part # onitpircseD

23-2C n)wohston(eldnah"T"emorhc/wteef6

Rocker Switch

3 positions, on-off-on, 6 terminals.

Part # onitpircseD

R-6955 lsanimret6,no-ffo-no,snoitisop3

Solderless Terminals

Part # onitpircseD

0125-44 alnimretgniR

0023-44 deapselamlanimretno-hsuP

0029-44 ctennocsidelameflanimretno-hsuP

0126-44 alnimretkrofroedapS

3002-24 ortcennocttuB

310809 ortcennocpat-T

3 - Way Switches

Part # onitpircseD

6855wercs3,no-ffo-no,snoitisop3

taspma51rofdevorppa.L.UslanimretCAV052taspma01,CAV521

2955wercs6,no-ffo-no,snoitisop3

stiucric2rofslanimret

1-2955edaps6,no-ffo-no,snoitisop3

stiucric2rofslanimret

41628 lsanimret9,no-ffo-no,snoitisop3

3204-0410 lsanimret21,no-ffo-no,snoitisop3

244

Control Brackets for Dash Mounting of Controls

Part # iontpircseD

A441 etkcarbhctiwsenilosag/sagPL

4422,hctiwsffokcoldnaeriwnedoBroF

.dedulcniswercsgnitnuom

443 ertemaideloH 3/8 x" 1/2 x" 1/2"

Plastic Primary Wire

Smooth finish thermoplastic insulation, stranded copperconductor. Provides good flexibility and color permanence.Impervious to oil, grease and diesel fumes.

Part # onitpircseD

eulb-0611 geuag61

56128 geuag61,eriwlellarap2/61

56138 geuag61,eriwlellarap3/61

5586 5592

Part # onitpircseD

9729 chtiwsremirP

Primer Switch

Heavy-duty, for either 6 or 12- volts. Has two binding headscrew terminals. Mounting stem has 7⁄16-28 thread, is 3⁄8" long.

144A

330

Carburetion - Miscellaneous

Benefits of Fresh Air Horsepower is directly related to the temperature of the airintroduced into the carburetor. For every 10° F of tempera-ture increase above 60° F you will lose 1% of availablehorsepower. The opposite is also true.

4" Flexible Duct

#traP onitpircseD

1-5H ctudelbixelf"84x"4

Fresh Air Inlet Shroud

#traP onitpircseD

1-6S udorhs"4

GB89

GB95

GB88GB87

GB80

NOTE: Pivot point to permit upright position on fender shield.

GB86

Fresh Air Canisters

Includes screw package,

#traP onitpircseD

2-9FA 0A03ACocpmI

Example:A vehicle producing 1OOHP at 160°F intake air. Reducing

the air temperature to 100°F by bringing in outside air willincrease horsepower by 6%. The net increase would be 6HP.

Converter Mounting Brackets

All brackets include mounting hardware.

331

Carburetion - Miscellaneous

Remote Fill Kit

#traP onitpircseD tyitnauQ

H7467evlavretlifkcehcelbuoD

1/2 noitcennocllifTPNF"1

01-LU52SS seohdiarberiW 5/8"4

4-LU52SS seohdiarberiW 1/4"

01-SF6l elviwsesohelameF 5/8"2

4-SF6l elviwsesohelameF 1/4"

B4-1E 1/4 x" 1/4 wobleelaMx"

1

D01-1E 5/8 x" 1/2 wobleelaMx"

E01-1U 5/8 x" 3/4 wobleelaMx"

SSB-R-0072 lecatpecerllifetomeR

FRD01eguagleveldiuqildexiF

ffo-tuhs/w

A11-4457 ertpadayramirP

2700R-KIT

Pressure Relief Vents

Pop-up relief vent assembly consists of nipple assembly,Iock-nut, rubber gaskets, spring and hex nut. Easily installedon a flat surface of auto body above trunk.

#traP onitpircseD

P-5992evlavfeilerpu-poPlacitreV-ylbmessa

09-1-PCRevlavfeilerpu-poP

lanoitceriD-ylbmessa

Note: Actual components may varydepending upon tank model and vehicleapplication. Please call our sales department for assistance.

332

Carburetion - Dual Curve Integrated Processors

AutotronicsFor Alternate Fuels & Clean Air

Digital Adaptive ProcessingFeatures1. Compensates for fuel variation.2. Maintains lowest emission levels.3. Provides load-sensitive ignition timing.4. Preserves OEM diagnostics & code storage.5. Maintains OEM gasoline fuel map.6. Compensates for altitude change.7. Produces top fuel mileage & driveability.8. Adapts to changes in engine calibration.

Ford Integrated Processor II

ApplicationThe Ford Integrated Processor II, PN 5916 is designed to sup-port either dedicated or bi-fuel conversions to LPG or CNGor 1992-1995 Ford pickup trucks with equipped with Sequen-tial Fuel Injection (SEFI) and either Thick Film Ignition (TFI)or Distributorless Ignition (DIS) systems.

Ford Integrated Processor III™

ApplicationThe PN 5918 is designed to provide total conversion supportfor 1994-1995 Ford Taurus or Mercury Sable 3.0L V-6engines.

PART NO. 5916

PART NO. 5918

tiKnIstraP t #raP tyitnauQ

IIrossecorPdetargetnIdroF 1695

1

ssenrahgniriW

—

evlavdionelostrop3

dionelosrofretlifriA

1/8 wobleecifiroTPN"

swercsgnitnuoM

4seitelbaC

spacknirhstaeH

ecafretnirotcejnileuFssenrah

1


rossecorPdetargetnIdroFIII

8195

1ssenrahgniriW

—

evlavdionelostrop3

retlifriamaoF

swercslatemteehS

4spacknirhstaeH

seitelbaC

333

Carburetion - Integrated Processors

AutotronicsGM Integrated Processor

FeaturesAll in One: Conversion Support, timing advance, & fuel control.Gasoline injector shut off relay control.Prevents false OBD codes on alternate fuel.Preserves factory gasoline computer block leam.Continuous closed loop diagnostic monitoring.Alternate fuels switching logic for system default to gasoline.Provides timing advance directly proportional to load.

GM OBD II™ Integrated Processor

ApplicationThe GM OBD II Integrated Processor is designed to supportdedicated and bi-fuel conversions to LPG, CNG, or LNG on1996 Chevrolet or GMC pickups equipped with the 4.3L, 5.0L,or 7.4L Vortec® engines. Use PN 5925 - for bi-fuel CNG forlow fuel - Auto/Switch.

F E D C B A

CBA

A B C D E F

tiKnIstraP # traP tyitnauQ

0295NP,rossecorpdetargetniMG 2095

1evlavdionelostrop-3

—


1/8 wobleecafiroTPN"

ecilpseriwpaT-T

tieselbaC

notsafelaM

notsafelameF

wercsgnitnuoM

7

4

2

2

4


rossecorPdetargetnIIIDBOMG 2495

1

ssenraHgniriW

—

dionelostrop3

dioneloswolfhgihtrop2

retlifriamaoF

wobleecifirodetarbilaC

ecifirotuohtiwwoblE

elppinxehssarB 1/8 TPN"

seitelbaC

swercslatemteehS

spacknirhstaeH

sguleriwelameF

batnoisnetxecitsalpdedloM

1tlobx23-01

tunx23-01

srehsawkcoL

2

1

4

4

4

4

2

334

Carburetion - Integrated Processors

Ford OBD II™ Integrated Processor

ApplicationThe Ford OBD II Integrated Processor PN 5944 is designed tosupport the conversion of the 1996-1997 OBD II light dutytrucks and cars with the IIC IV system and the 104 pin PCMto LPG, LNG, or CNG.

Autotronics

Chrysler Integrated Processor™

ApplicationThe Chrysler Integrated Processor™ is designed to supportdedicated or bi-fuel conversions to LPG or CNG of 1994-1995Chrysler Corporation vehicles equipped with longitudinallymounted engines (i.e.: engines, without electric coolingfans.) These include full size V-6 and V-8 pickups and vans,along with V-10 pickups, and Dakota pickups. PART NO. 5930

ABCD

DCBA

ABCDEF

PN 5944


rossecorPdetargetnIrelsyrhC 3095

1ssenraHgniriW

—

dionelostropeerhT

retlifriamaoF

seitelbaC

4swercslatemteehS

spacknirhstaeH


rossecorPdetargetnIIIDBOdroF 4495

1

ssenraheriW

—ssenraheriwrotcejnI

batgnitnuomcitsalpkcalB

evlavdionelostrop3 4804

retlifriamaoF

evlavdionelostrop2 5104

edapseriwdetalusnielameFslanimret

—

2

xehssarB 1/8 elppinTPN"

spacknirhstaeH

wobledecifirO 49041

woblE -29404

swercslatemteehS

—

4

srehsawkcol-2tun23-011

tlob23x01

1

6

335

Carburetion - Integrated Processor Guide

AutotronicsThis convenient guide will help you determine the correct Dual Curve components needed to convert your vehicle to alternatefuel operation. You can find the right Integrated Processor to give you maximum performance, lower emissions and great dri-veability for the best quality conversion.

Chrysler/Dodge/Jeep Cars & Trucks

Ford Cars & Trucks

GM Cars & Trucks

336

Carburetion - Timing Optimizers

Autotronics

*Not for sale or use in California on pollution controlled motor vehicles,except with approved equipment.

Ford Timing Optimizer

Applications• Fits Ford 1984-93 cars, trucks, & vans w/TFI distributor ignitions.• Fits Ford 1988-1993 cars, trucks w/DIS ignitions.Note: This unit is not designed for the new EDIS ignitions found on the 1990-1993 4.0L and 4.6L engines. Use PN 8696 for EDIS ignitions.

Features• Offers selectable LPG or CNG timing curves.• State of the art, factory compatible, direct plug-in design for

Ford vehicles with TFI (Thick Film Integrated) distributors andDIS (Distributors Ignition System) ignitions.

• Fits most Ford 1984-1993 cars, trucks, and vans with distribu-tors or with DIS ignitions (except '90-'93 EDIS 4.0L & 4.6L en-gines, use PN 8696).

• Offers 4, 6, & 8 cylinder programming capabilities.• No adjustment of the distributor during installation is required.• Direct plug-in connectors mate with the vehicle's factory timing

“Spout” connector.• Employs “anti-backfire logic” during start-up and under load.• Fits most Ford 1984-1993 cars, trucks, and vans with distribu-

tors or with DIS ignitions (except ‘90-‘93 EDIS 4.0L & 4.6L en-gines, use PN 8696).

• Unique ability to provide timing advance directly proportionalto load. Allows spark timing advance for increased vehicle per-formance without increasing NOx emissions when installedwith the O2 Fuel Control II, PN 4046.

GM Timing Optimizer

Features• Exclusive connectors for directplug-in to MAP sensor• Increases gas mileage, vehicle performance on LPG or CNG• Unprecedented design provides flexible spark timing

advance unlike any other unit presently In existence• No timing adjustment/automatically programs 4, 6, or 8 cyl.• Direct plug-in with all GM MAP sensors• Allows spark timing advance for increased vehicle per-

formance without increasing nox emissions• Priced well below any other spark timing advance unit

available in alternate fuel marketplace• The GM timing optimizer comes complete with all neces-

sary components and parts in one easy-to-order kit.

#traP onitpircseD

*6604 erzimitpOgnimiTdroFGNC/GPL

#traP onitpircseD

7504 erzimitpOgnimiTMG

337

Carburetion - Chrysler Supports & Injector Module

AutotronicsChysler Support 1

ApplicationsAll 1992 thru 1995 V-6 Dakota and 318 (ONLY) trucks andvans with MPFI.

Chysler Support IV

ApplicationsThe Chrysler Support IV employs a direct plug-in design for1988-On Throttle Body Injection (T.B.I.) V-6 Dakota and V-8318 & 360 trucks, with the O2 Sensor Support built-in. Thisunit will cure the “Check Light” and the computer memorycode #26 (On Dodge) for “Fuel Injector Drivers”, when usedwith Autotronic 4046 O2 fuel controller.

ApplicationThe Chrysler OBD II Injector Module™ is designed to be usedalong with the Chrysler Integrated Processor™ PN 5930, theChrysler CNG Boss™ PN 5933, or the Chrysler Support 1 ™

PN 4121 on 1996 and beyond Chrysler Corporation vehiclesequipped with 3.9L V-6, V-8, and V-10 engines and OBD IIPowertrain Control Module (PCM). These vehicles consist offull size pickups and vans, and the Dakota pickup equippedwith the 3.9 L engine. The PN 4126 is also designed for con-versions of the 1996 Jeep 4.0L straight engine.

#traP onitpircseD

6214 leudoMrotcejnIDBOrelsyrhC

#traP onitpircseD

1214 t 1roppusrelsyrhC

#traP onitpircseD

4214 IVtroppusrelsyrhC

AutotronicsChrylser OBD II Injector Module™

YELLOW

GREENTO FUEL INJECTOR

GREEN

TAN

BLACK

BLUE

338

Carburetion - O2 Fix

AutotronicsSuperfix 1

The super fix 1 is designed to inform the ECM (ElectronicControl Module), computer and sensors when on alternatefuels that 3 basic computer functions are working properly.Codes 13, 32, 44 and 45 are directly related to problems theSuper Fix 1 can solve.

Features1. Supplies a Rich/Lean O2 feedback signal the ECM. Pre-

vents O2 sensor codes (13, 44, and 45).2. Monitors ECM signals related to exhaust gas recirculation

(EGR) and the fuel system, then it responds with the cor-rect signals. Prevents false EGR performance warningcode (32).

3. Prevents false knock sensor warning code (43) and com-puter limp-mode spark timing retard on alternate fuels,which leads to poor driving, low mileage, and highexhaust temperatures.

The “6M” is designed with direct plug-in capabilities to theengine MAP (Manifold Absolute Pressure) sensor and obtainsits logic from maifold absolute pressure rather than throttleposition.

#traP onitpircseD

M6-9878PAMotnisgulP.rosnesVPTwen/wMG59-78911xiFrepuS

)S6-9878n/periuqersracecilopecirpaC1991(rosnes

A6-9878Oelgniss'1xiFrepuSehtsetamelbacretpadA 2 ehtotrosnes

Oeriwelbuods'yrotcaf 2 .rotcennocrosnes

B6-9878 rsosnes.zo3ot1,elbacretpadA

#traP onitpircseD

2-9878relsyrhC,78-2891sracMGrosneseriwelgnis,xiFretupmoC

59-8891skcurt/sracdroF,19-8891skcurt/srac

Computer Fix

The O2 Fix is designed to inform the ECM (Electronic ControlModule), when on ALTERNATE FUELS that 02 sensor com-puter functions are working properly. When the O2 Fix isswitched to gasoline mode, the proper gasoline function willbe sent to the computer. All O2 sensors are the same in volt-age output and switching characteristics. Most vehicleshave a single wire or a 3-wire heated O2 sensor. We recom-mend the P/N 8789-2* (Single Wire) O2 Fix. This unit can beadapted to any make or model vehicles O2 sensor, U.S.A. orforeign. Note: 1989 Dodge Dakota and V-8 trucks use a 4-wire O2 sen-sor. Use only the P/N 8789-2* O fix.

339

Carburetion - O2 Fuel Control & Mixture Monitor

Autotronics O2 Fuel Control II

The O2 Fuel Control II regulates the air/fuel (A/F) mixtureratio when a vehicle is powered by alternate fuels. This con-trol of the A/F mixture ratio is based on the voltage signalsproduced by the vehicle’s factory O2 sensor - mounted onthe exhaust system.


O2 lortnocerutximleuf/ria 46041

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Autotronics Mixture Monitor

ApplicationThe Mixture Monitor comes with a direct plug-in cable har-ness, PN 4042, and will adapt to Autotronic Air/Fuel MixtureControl Products PNs: 4045, 4046, and the forklift “CO”controller 4047.

OverviewThe Mixture Monitor is a multi-purpose instrumentdesigned for monitoring and tuning carbureted, fuel inject-ed, propane or natural gas powered vehicles.

The Mixture Monitor provides managers and technicianswith the ability to monitor and analyze the vehicle’s “idealmixture” of air and fuel to ensure maximum power and lowexhaust emissions.

The Mixture Monitor has been designed to interface withAutotronic‘s Air/Fuel Mixture Controller‘s: 4045, 4046, andthe new 4047 Forklift Controller.

NOTE: An optional universal harness, 4043, is available tomonitor other O2 sensors.

The Mixture Monitor relies on the vehicle‘s O2 sensor toanalyze the exhaust air/fuel mixture. (Vehicles without anO2 sensor can be updated by ordering the required supple-ment accessories from Autotronic Controls Corporation).

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340

Carburetion - Motor Fuel Tanks

ManchesterPick-up, In Bed Mount Tanks

Large capacity bed mount tank for narrow bed pick-ups andtrucks with utility bodies. Fits all makes & all years. Valvesinstalled vertically. Gauge is visible through rear window foreasy viewing.

Under Tool Box Mount Tanks

For Small pick-up trucks or narrow bed full-size pick-ups. Fitsmost makes and most years. May require tool box to beraised. Gauge on driver‘s side for easy viewing.

School Bus Tanks

Widely used on large school buses

Slick Tanks

Very popular tank for utility vans.

Vapor Seal Box Tanks

Universal manifold tank adapts well to vehicles withrecessed or sloped trunk floors. Adjustable mounting brack-ets on 12" tank. Requires remote fill.

Extra Heavy Duty Strap Brackets

Available in 14" through 24" diameters.Required for school buses.

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341

Carburetion - Impco Starting Problems

Starting has never been a serious problem when dealingwith straight LP-gas engines. However, with dual fuel appli-cations, especially those under 250 CID, there are many fac-tors that can contribute to hard starting. These are:1. Vacuum and air leaks.2. Incorrect carburetor sizing.3. Improper idle mixture.4. Over richening by start valve.5. Incorrect location of carburetor, regulator, and/or fuelock.

6. Improper location of electric fuelock lead.7. Poor engine condition.8. Incorrect spark plug gap.9. Cold ambient air temperatures.10. Incorrect starting technique.

Vacuum & Air LeaksIn dual fuel applications on small displacement engines, anair leak which would not bother a larger engine becomescritical, especially at cranking speed. Any leak downstreamof the air/gas valve will reduce the amount it will rise off itsseat during cranking.In extreme conditions, air enters through the leak duringthe entire intake stroke, while the gas valve is lifted onlyduring part of the stroke. This creates a mixture too lean toburn. A primer may furnish the added fuel around themetering valve to allow the engine to start, and with morenumerous intake cycles the leak may be overcome.Vacuum leaks may be detected by applications of small

amounts of LP Gas vapor around suspected air leaks down-stream of the air valve. It is suggested that an unlit propanecigar lighter be used, since a small flow is all that is neces-sary. If a leak is located, the engine will speed up, due to thericher mixture. This technique is quite effective around thegasoline carburetor area. Take care to do this out of doors,since adequate ventilation is a must.Air leaks may also be found in the engine, through intakevalve seals or past rings which are not seated. The orifice inthe PCV valve, which is open during cranking and closedunder vacuum, can add a sizable amount of air. Be sure PCVvalve does close properly after engine starts.

Carburetor SizingImpco has found that the CA50-250L or -750L on engines of1600cc & under will give better performance and superiormileage as well as better starting than the CA125. TheCA125-250 and 260 are adequate for engines 100 to 200 CID,the CA300A for 200 to 320 CID and the CA300A-50 for 320CID & over.It is important to correctly size the air flow capacity of themixer to the engine requirement.

Use of a mixer that is too large for the engine displacementmakes idle adjustment extremely sensitive. When the larg-er mixers are applied to smaller engines, enrichment for ac-celeration or power occurs too high in the RPM range to bepractical. The small engine cannot lift the large air valvequickly or as high as a larger engine will.

ber valve contacts the seat and stops turning. Back theadjustment out 3⁄4 turn, re-install elbow. Advance idle speedadjustment screw a turn or so to keep the engine running,then start engine. The idle should be set cold or cool. Adjustthe valve in and out gently to determine where the enginespeeds up (best vacuum). For final setting, slow idle speedto desired setting. When testing between adjustments,place finger over the opening to the idle mixture screw toprevent air entry. Install idle adjustment plug after desiredidle is obtained.Use of the SV start assist valve for priming during crankingis helpful. However, on engines two liters and under, arestriction such as the Impco J1-20 (1⁄16" I.D.) should be used.If these are not available, a spark plug nut, approximately1⁄16" I.D., pushed into the hose, will prevent over priming.Sizing the orifice to the engine can be checked for accuracyby energizing the SV valve separate from the starting cir-cuit. When activated with the engine idling, it may slow thespeed or actually kill the engine. However, if by opening thethrottle it will start in a turn or two, the orifice size is satis-factory.The SV should always connect to air valve vacuum, notintake manifold.

Idle Mixture AdjustmentCorrect idle mixture adjustment is critical to ease of start-ing. This is compounded if the mixer is oversize for theengine. When the idle mixture (air by pass) adjustment isclosed, the air valve will open farther at cranking. Thus theair flow volume remains the same, but gas is increased.If the engine starts hard, check the idle mixture adjustment,following this procedure. Tighten the idle mixture screw in.If the engine starts more easily, slow the engine downwhile adjusting the idle mixture to prevent stalling from anover-rich mixture. Setting the idle mixture to the best idle(high vacuum) cold will give a reasonably lean but satisfac-tory mixture after the engine warms.If the idle adjustment must be backed out excessively inorder to obtain a smooth idle, this may be compensatedfor by installing an R1-29 spacer ring (for CA125 mixer).Placed between the air valve ring (R1-19) and the air valveshoulder, it raises the R1-19 by .003~, thereby increasingair flow at idle. This allows the idle screw to be adjusted into richen the mixture, shutting off most of the bypass airand lifting the air valve farther off the seat during cranking.Setting the idle on a CA300A mixer is touchy on a smallengine because of the large gas valve. With the gas inletelbow removed, screw the idle adjustment in until the rub-

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Location of ComponentsMounting the converter and fuelock off the engine is desir-able when carbureting 4-cylinder engines. The vibration ofthe engine moves the converter rapidly back and forthwhile the secondary diaphragm assembly tends to stay still.This causes the gas pressure to pulse, and can cause excessfuel consumption.The added weight of an LP Gas mixer and adapter on agasoline carburetor, if not properly braced, can combinewith the vibration of a 4-cylinder engine to cause the gaso-line carburetor bolts and screws, etc., to loosen, causing airleaks.Keep the atmospheric vent of the regulator out of the directair stream of the fan. This also can cause fluctuation of thesecondary diaphragm and result in gas pressure pulsa-tions.

Electric Fuelock ConnectionIs often a source of starting trouble. Attaching the electricfuelock power lead to an ignition coil terminal. This is aweak source of current. And, it robs the ignition of neededamperage.

Engine ConditionAs previously mentioned, the engine itself can be a source

of air leaks. Leaking intake seals, poorly seated rings, andleakage through the PCV valve hose are problem areas tobe checked. Beyond these problems, however, the enginemust be in good working order. Check the engine for anyleaks downstream of the air valve. Compression pressureof 150 psi or better at cranking is desirable to prevent hardstarting.

Incorrect Spark Plug GapSpark plugs should be in good condition and gapped to .03"to .032". A protruded nose plug is helpful if it will clear thepiston at the top of its stroke.

Ambient TemperatureAt very cold ambient temperatures (-30°F., -34°C. or below),there may be insufficient vapor pressure in the fuel tank tosupply fuel to the converter/regulator, resulting in no startor hard starting. Another condition which may preventstarting in cold weather involves over priming. If this con-dition is suspected, attempt to start the engine with theprimer disconnected. The primer can be disconnected byremoving the electrical connector or by pinching the fuelhose.

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Repair and seal air leaks. Engines with less than 150 PSI compression may require valve grind, valve seals, and/or rebuilding to obtain optimum starting.

Troubleshooting — Hard Starting

Mixer is of proper capacity. Mixer is of improper capacity.

Possible Cause: Loose vapor hose fittings or leaking vapor hose.

Replace mixer with one of proper airflow capacity.

Check vapor hose and fittings with soapand water solution to detect leaks.

Check that power lead is not connected to an ignition coil terminal.

Power lead is connected to strong source. Power lead is connected to ignition coil terminal.

Reconnect lead to strong source of 12 VOLT current.

Spark plug gap is correct.

Engine condition poor.

Spark plug gap is incorrect.

Clean and gap spark plugs .030" to .032".Verify that rest of ignition system is in good working order. If no problems are found,

investigate the possibility of engine mechanical problems.

Possible cause: poor engine condition.

Check engine for compression of 150 PSI or better at cranking. Inspect for air leaks downstream of

the air valve.

Remove spark plugs and measure for correct gap.

Hose and fittings not leaking. Hose and fittings leaking.

Possible cause: Weak current to electric (gasoline or LP-Gas) fuel lockoff.

Replace leaking vapor hose. Tighten or replace loose fittings.

Possible cause: Incorrect spark plug gap.

Hard starting is apparently not a fuel related problem. Recheck the system and investigate

the possibility of an ignition problem.

Check idle mixture for proper setting. Richen idlemixture as an aid to starting. 300A mixer idle

screw out (counter clockwise) l⁄4 turn. CA425 out one to two turns CA 125, CA 225 idle screw in

(clockwise) two turns.

Idle mixture properly set. Idle mixture out of adjustment.

Possible cause: Oversize carburetion sizing.Refer to "Idle mixture adjustment" section for proper

setting technique.

Verify that airflow capacity of mixer is correctly sized to engine requirement (See IMPCO publication

SL-7 “How to select the right carburetor").

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Carburetor O.K.

Possible cause: Improper idle mixture.

Review proper starting technique with driver.Explain reasons for open throttle conditions.

Fuel supply O.K. No fuel supply.

Possible Cause: Cold ambient air temperatures Check fuel tank valve. Check hose, fittings and VFF30 filter for restrictions.

Verify that there is no over priming. Disconnect SV valve if over priming exists.

Engine does not start. Engine starts.

Circuit complete. Circuit incomplete.

Engine does not start. Engine starts.

Possible cause: Improper starting technique. Insert orifice in 1⁄4" SV valve hose. Refer to "Startvalve enrichment" section.

Possible cause: Lack of priming or over priming(If over priming is suspected refer to

"Cold ambient air temperature").

Possible cause: No fuel supply to convertor.

Insert matchstick into VFF30 atmospheric vent(front cover). Diaphragn within should resistpressure. Indicating fuel supply to regulator.

Verify the condition. Perform visual inspection of fuel systemcomponents and attempt to start engine. Use open throttle.

Test for battery voltage and continuity toground in the electrical primer circuit during cranking.

Jump battery to primer contact.

Primer does not click.

Repair circuit as necessary.

Replace primer.

Primer clicks, engine does not start.

Possible cause: Vacuum and/or air leaks.

Tight mounting. Loose/leaking mounting.

Check for loose carburetor mounting bolts or aleaking mounting gasket.

Check for cracks in the gasoline carburetorhousing (if dual fuel) or intake manifold.

Tighten mounting bolts or replace gaskets.

Cracks noted.

Replace the carburetor or intake manifold.

Troubleshooting — Hard Starting

345

Carburetion - Lean Idle Condition & Vehicle Electrical System

Impco Lean Idle Condition

Model 425 SeriesThe pictures of the idle diaphragm assemblies show a cor-rect and an incorrect assembly configuration. The assemblywith the straight lever allows normal movement of the Vitonvalve off the valve seat, providing a full opening of the idlegas jet when adjusted rich. The bowed lever reduces avail-able lift off the seat by limiting the travel. The bowed assem-bly can be straightened easily by bending to conform to astraight edge ruler or equivalent.In reassembling the idle diaphragm cover to the body, theidle mixture adjustment screw must be backed out until itis engaged by only three or four threads in the cover. Thiswill allow assembly of the cover to the body and idlediaphragm assembly without bending the tip of the lever.

Incorrect Assembly ConfigurationCorrect Assembly Configuration

After the diaphragm and cover are reassembled, the idle mix-ture adjustment screw may be turned in until the retainerspring is compressed about one third. With the engine run-ning at idle, adjust the screw in or out for best idle vacuum.If the idle mixture is set with a cold motor to the smoothestpossible idle, the mixture when the engine is hot will leanout to a practically ideal mixture for minimum CO readings,without being too lean, thereby causing misfire.

Mak-Saf™

Vehicle Electrical System

The Mak-Saf™ is a UL listed device that allows the isolationof a vehicle’s battery, or alternator from the rest of the elec-trical system by pulling a cable-connected handle. The han-dle can be mounted in the instrument panel or hidden. FeaturesSafety Switch — Ensures a no-start condition particularlyfor equipment used in dangerous atmospheres such as LPtransport vehicles.Prevent Battery Drain — For vehicles like RVs & constructionequipment that are left inoperative for long periods of time.Anti-Theft — Hide the handle in a clever but convenient place.

ApplicationFork lifts, tank transports, off-road construction equipment, cars.

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346

Carburetion

Documents

IMPORTANT INFORMATION - Gas · PDF fileIMPORTANT INFORMATION: ... Due to improved intake manifold design, use 100% of ... Impco Carburetor (Mixer) Sizing M od e l # R e l a t e d